Electrolyte membrane for all-solid-state battery, and all-solid-state battery comprising same

In a solid electrolyte membrane according to the present disclosure, an ion conduction blocking layer is formed in the electrolyte membrane by a polymer material having low ionic conductivity by phase separation of polymer under the high temperature condition such as an increase in the internal temperature of a battery, to block the movement of lithium ions. The formed ion conduction blocking layer (hereinafter referred to as blocking layer) prevents thermal runaway and consequential explosions of the battery, thereby improving the heat resistance safety of the battery.